package com.microstation.interceptor;

import com.alibaba.fastjson.JSONObject;
import com.microstation.common.AppConst;
import com.microstation.common.Result;
import com.microstation.enums.ResultEnum;
import com.microstation.util.CookieUtil;
import com.microstation.util.ResponseUtil;
import org.apache.log4j.Logger;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class CookieInterceptor extends HandlerInterceptorAdapter {
    public static final String LAST_PAGE = "";
    private static final Logger log = Logger.getLogger(CookieInterceptor.class);// 日志文件

    /**
     * 在业务处理器处理请求之前被调用 如果返回false 从当前的拦截器往回执行所有拦截器的afterCompletion(),再退出拦截器链
     * 如果返回true 执行下一个拦截器,直到所有的拦截器都执行完毕 再执行被拦截的Controller 然后进入拦截器链,
     * 从最后一个拦截器往回执行所有的postHandle() 接着再从最后一个拦截器往回执行所有的afterCompletion()
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        // log.info("==============执行顺序: 1、preHandle================");
        String requestUri = request.getRequestURI();
        String contextPath = request.getContextPath();
        String url = requestUri.substring(contextPath.length());
        Cookie cookie = CookieUtil.getCookieByName(request, AppConst.COOKIE_NAME);
        //System.out.println("===="+JSONObject.toJSONString(cookie));
        if (cookie == null) {
            Result result = new Result();
            result.setHasError(true);
            result.setResultEnum(ResultEnum.NOSESSION);
            result.setErrUrl("login.html");
            ResponseUtil.write(response, JSONObject.toJSONString(result));
            return false;
        }
        return true;
    }

    /**
     * 在业务处理器处理请求执行完成后,生成视图之前执行的动作 可在modelAndView中加入数据，比如当前时间
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
                           ModelAndView modelAndView) throws Exception {
        // log.info("==============执行顺序: 2、postHandle================");
        // System.out.println("==============执行顺序:
        // 2、postHandle================");
        //if (modelAndView != null) { // 加入当前时间
        //    modelAndView.addObject("var", "测试postHandle");
        //}
    }

    /**
     * 在DispatcherServlet完全处理完请求后被调用,可用于清理资源等
     * <p>
     * 当有拦截器抛出异常时,会从当前拦截器往回执行所有的拦截器的afterCompletion()
     */
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
            throws Exception {
        // log.info("==============执行顺序: 3、afterCompletion================");
        // System.out
        // .println("==============执行顺序: 3、afterCompletion================");
    }
}
